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CKA study material · question 248 of 1000

A Service's cluster IP cannot be pinged, though the Service works. Why?

  1. The Service IP is virtual and answered by no host
  2. kube-proxy drops ICMP to save rules
  3. ICMP is blocked by NetworkPolicy by default
  4. Only NodePort Services respond to ICMP
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Answer: A. The Service IP is virtual and answered by no host

A Service IP is a virtual address realised by kube-proxy's packet rules; no single host answers it.

Source: Virtual IPs and Service Proxies (Kubernetes) — IP address assignment to Services

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